DER-630 - 12 W high efficiency, high power factor, isolated flyback smart lighting power supply using LYTSwitch-6

This engineering report describes a 12 W isolated flyback power supply with a single-stage power factor correction circuit for smart lighting applications. The power supply is designed to provide a 27 V constant voltage output with an output current load of 0 mA to 450 mA and an input voltage range of 90 VAC to 265 VAC. The power IC controller device LYTSwitch-6 combines primary, secondary and feedback circuits in a single surface mount offline flyback switch IC. It contains the primary MOSFET, primary side controller and secondary side synchronous rectification controller. The device also features innovative FluxLink™ technology that safely bridges the isolation barrier and eliminates the need for an optocoupler. The DER-630 using LYTSwitch-6 IC is a universal input flyback converter design with added switching valley fill PFC circuitry. The design provides a high-efficiency constant-voltage power supply with fast transient load response. Through the PFC circuit, the design achieves high power factor at universal input. The key design goals are to achieve high efficiency and high power factor over the input voltage range. The file contains power supply specifications, schematics, bill of materials, transformer documentation, printed circuit layout, example real-world application circuits in the appendix section, and performance data